I lost R149 because of her Negligence

Yesterday on 27th May 2015 I went to Cell C Boulders Mall shop8(***)B to buy Data bundles for my Cell C Sim Card, the lady who was helping me her name called Mpumi Namo firstly gave me an attitude of not interested to help me while I needed help for Cell C data Bundles as it was my first time buying data bundles for Cell C modem. She was busy on her phone while I was asking for help then I asked R149 data bundles and she asked for my Cell number I gave it to her. She punch it on her PC and she didn't confirm it and there is no screen on the counter where you can see if its a right number. I went home and when I wanted to use my modem on the PC it said there are no data bundles. When I check the Cell number on the slip, the last digit is wrong she put 8 instead of 7. I went back to her today(2015-05-28) to show her the number she punched on the slip, she said she confirmed the number with me, I am the one who gave her the wrong number. She left me and help the customer and she said I can put a complain if I want and write her name on it she doesn't care she is not working for me. So I need help from Cell C to refund me, this is a typing error not my mistake I know my number.